Token; lead; obverse: running rabbit, letter above; reverse: circle with cross patée between four dots.
- Found/Acquired: Somme, River (?)
- (Europe,France,Picardy,River Somme)
- Diameter: 1.4 centimetres
23 March 2011
Reason for treatment
Stabilize chemically and physically. Clean, repair and support as necessary
The objects are unstable. Active corrosion is present on most of the surface.The corrosion is very powdry.
Before consolidative electrolytic reduction (CER) the objects were twice rinsed in white spirits and twice rinsed in acetone to remove any wax or lacquer that could be present from prior treatments. They were then placed in a tank on 14/5/09 with a 5% Sodium carbonate in deionised water electrolyte with an initial current of 410mA. This was lowered to 10mA in 6 hours. The objects were removed from the tank after reduction was completed on 29/05/09.Some areas still showed white areas, that didn't respond to the CER treatment. These areas were treated with local electrolytic reduction (LER). 10% sulphuric acid in deionised water was used as an electrolyte. A part of the corrosion was reduced, but also the swabbing with the cotton wool tip that is used to hold the elctrolyte, removed some of the corrosion.They were rinsed under running tap water for an hour. They were placed in tap water for half an hour in which a few drops of 15% sulphuric acid was added (pH of 2.8-3.4), to form a stable protective layer. They were then rinsed in running tap water until the water was neutral.During the CER treatment the objects were twice removed from the electrolyte over the weekend (15/5 and on 22/5). When they were taken out of the electrolyte they were placed in slightly acidified tap water (a few drops of 15% sulphuric acid was added tot the water) and they were then rinsed for an hour until it was neutral. Finally two layers of Paraloid B75 (3% in acetone) were applied with a brush to consolidate the surface and to enhance the appearance. The objects were renumbered.
Prehistory and Europe
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Object reference number: MCN11613
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